DELAYED2 years late40% CONFIDENCEWikipedia[1] states the station "as of May 2026, is not scheduled to open until October 2028"; no day is given, so the pin sits on 1 October 2028.
Samseong is the in-fill station between Seoul Station and Suseo on the GTX-A express line, sitting inside the Yeongdongdaero transfer complex in Gangnam. In May 2026 inspectors found 50 of the 80 support columns on the fifth basement level had one layer of reinforcement where the design called for two, and Hyundai Engineering and Construction is covering the roughly 3 billion won repair.
DELAYED3 years late40% CONFIDENCESatellite Concourse 1 "began vertical construction in April 2026 with a targeted completion date of late 2028" - a season rather than a day, and one that has already moved.[1]
The first of two satellite concourses west of O'Hare's terminal core, designed by Skidmore, Owings & Merrill with Norviska and designated Concourse D, is reached by an underground tunnel from the terminals. Vertical construction started in April 2026; the $1.45 billion concourse is the first piece of the O'Hare 21 rebuild to be delivered, a programme approved in 2018 at $8.5 billion and now put at roughly $12 billion in current dollars.